[PATCH v6 11/21] x86/bugs: Add attack vector controls for spectre_v1

[David Kaplan <david.kaplan@amd.com>]

Use attack vector controls to determine if spectre_v1 mitigation is
required.

Signed-off-by: David Kaplan <david.kaplan@amd.com>
---
 arch/x86/kernel/cpu/bugs.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index dc3f9a2e6984..f4b3d879ba38 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -1140,13 +1140,16 @@ static bool smap_works_speculatively(void)
 
 static void __init spectre_v1_select_mitigation(void)
 {
-	if (!boot_cpu_has_bug(X86_BUG_SPECTRE_V1) || cpu_mitigations_off())
+	if (!boot_cpu_has_bug(X86_BUG_SPECTRE_V1))
+		spectre_v1_mitigation = SPECTRE_V1_MITIGATION_NONE;
+
+	if (!should_mitigate_vuln(X86_BUG_SPECTRE_V1))
 		spectre_v1_mitigation = SPECTRE_V1_MITIGATION_NONE;
 }
 
 static void __init spectre_v1_apply_mitigation(void)
 {
-	if (!boot_cpu_has_bug(X86_BUG_SPECTRE_V1) || cpu_mitigations_off())
+	if (!boot_cpu_has_bug(X86_BUG_SPECTRE_V1))
 		return;
 
 	if (spectre_v1_mitigation == SPECTRE_V1_MITIGATION_AUTO) {
-- 
2.34.1